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  <dxl:Comment><![CDATA[
	Objective: When a NLJ has a parallel union operator as one of it's
	child, ensure that the a blocking spool is enforced by the rewindability
	enforcer, when there is motion hazard in NLJ.

	create table foo(a int);
	create table bar(a int);
	create table t1 (c1 integer);
	create table t2 (c2 integer);
	insert into t1 values (generate_series (1,10));
	insert into t2 values (generate_series (1,3000000));

	set optimizer_parallel_union = on;

	select * from foo join ((select bar.a from bar left join t1 on true) union all select * from t2) as tab on true;
  ]]>
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